库仑场对非对称量子点中弱耦合极化子的影响  

Influence of Coulomb field on weak-coupling polaron in an asymmetric quantum dot

作　　者：牧仁[1] 肖景林[1] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043

出　　处：《量子电子学报》2011年第4期490-494,共5页Chinese Journal of Quantum Electronics

基　　金：内蒙古自治区高等学校科学研究项目(Njzy08085)

摘　　要：采用线性组合算符和幺正变换方法,研究了库仑场对非对称量子点中弱耦合极化子激发态能量及振动频率的影响。导出了非对称量子点中弱耦合极化子的激发态能量、振动频率随量子点的横向和纵向有效受限长度、库仑束缚势和电子-声子耦合强度的变化关系。结果表明:当库仑束缚势一定时,束缚极化子的振动频率、极化子第一内部激发态能量随量子点有效受限长度的减小而迅速增大,随库仑束缚势的变化而变化,第一内部激发态能量随库仑束缚势的变化有一个极小值。The influence of Coulomb field on the properties of the excited state of weak-coupling polaron in an asymmetric quantum dot was studied by the linear combination operator and unitary transformation method.Relations of vibrational frequency,the first excited state energy of weak-coupling polaron in an asymmetric quantum dot with effective confinement length of quantum dot,Coulomb bound potential of weak-coupling polaron in an asymmetric quantum dot are obtained.It is shown by evaluating numerically that the vibrational frequency,the first internal excited state energy increase rapidly with the effective confinement length decreasing when the Coulomb bound potential is determined,and the vibrational frequency increases with the Coulomb bound potential increasing,the first internal excited state energy has minimal value with the Coulomb bound potential increasing when effective confinement length is determined.

关 键 词：光电子学 非对称量子点 线性组合算符 弱耦合极化子 库仑场 

分 类 号：O469[理学—凝聚态物理]